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You are required to keep your bike legal in terms of the Road Traffic Act Construction & Use Regs.  The so-called “daytime MoT is just an MoT with an advisory note saying it’s not for use in darkness (or something like that, I’ve never seen one).

So far as I have seen and can recollect, your bike can be disqualified from free tax and MoT exemption, by major modifications.  Don’t take my word as law, but I don’t call removal of ancillaries like lights a major modification. 

https://www.gov.uk/historic-vehicles

“You do not need to get an MOT if:

• the vehicle was built or first registered more than 40 years ago
• no ‘substantial changes’ have been made to the vehicle in the last 30 years, for example replacing the chassis, body, axles or engine to change the way the vehicle works

If you’re not sure if there have been any substantial changes you can:

• read the full guidance on MOT exemptions for historic vehicles
• speak to a historic vehicle expert”

There is a list of modifications somewhere. I bet the VMCC and the owners’ clubs are well up in it.